diff --git a/src/PhpSpreadsheet/Shared/StringHelper.php b/src/PhpSpreadsheet/Shared/StringHelper.php
index d6a00e8a..c4d43161 100644
--- a/src/PhpSpreadsheet/Shared/StringHelper.php
+++ b/src/PhpSpreadsheet/Shared/StringHelper.php
@@ -495,7 +495,7 @@ class StringHelper
     public static function convertEncoding($value, $to, $from)
     {
         if (self::getIsIconvEnabled()) {
-            return iconv($from, $to, $value);
+            return iconv($from, $to . '//IGNORE//TRANSLIT', $value);
         }
 
         if (self::getIsMbstringEnabled()) {